Drive mechanism for ore-concentrators.



no. 673,058. I Patemd Apr. so, 190|.

' M. S. LEVE.

DRIVE MECHANISM FR ORE CNCENTBATRS.

(Application led. Mar. 14', 1900.) (No Model.) y 3 Sheets-SheetA I.

No. 673,058. Patented Apr. 30, I90I.

M. s; LEv.

DRIVE MECHANISM FDR ORE CDNCENTRATORS.

(Application lad. Mar. 14, 1900.) (No Model.) 3 Sheets-Shut 2-.

WITNEEEEE. INVENTDPL No. 673,058. Patented Apr. 3o, 190i.'

M s. LEVE. DRIVE MECHANISM FOR 08E CUNCENTRATURS.

(Application filed. Mar. 14, 1900.) (No Model.) 3 Sheets-Sheet 3.

WITNESSES. INvEN-m www@ 4;/ maaar UNITED STATES PATENT OFFICE.

MARCUS S. LEvE, oF EEUITVALE, CALIFORNIA, AsSIeNoE To WILLIS e. DoDD, oF SAN FRANCISCO, CALIFORNIA.

DRIVE MECHANISM FOR ORE-CONCENTRATORS.

SPECIFICATION forming part of Letters Patent No.`673,058, dated April 30, 1901.

Application filed March 14, 190( Serial No. 8.635. (No model.)

To all whom it may concern:

Beit known that I, MARCUS S. LEV, a citizen of the United States, residing at Fruit- Vale, county of Alameda, and State of California, have invented certain new and useful Improvements in Drive Mechanism for Ore- Concentrators; and I do hereby declare the following to be a full, clear, and exact descriptionof the same.

The present invention relates to drive mechanism which is more especially applicable for operating that class or type of concentrators having inclined reciprocating riffled tables, onto which the ore-pulp is fed at one corner and is carried longitudinally forward to the discharge end or opposite corner, due to the combined action of gravity and the reciprocating motion given the table.

The object of the invention is to provide mechanism capable of imparting such a motion to the table that any material placed thereon will be forced to advance forward from the point of feed to the point of discharge, the mechanism being capable of such adjustment that the force or speed of the advancing material can be fully controlled and at the same time give more or less agitation to the pulp, thus adapting the machine to the varying conditions met with in concentration due to the different specific gravities of minerals and their attendant gangue or quartz.

In order to comprehend the invention, reference should be had to the accompanying sheets of drawings, wherein- Figure 1 is a longitudinal sectional view, in side elevation, oi' the drive mechanism. Fig. 2 is a top plan view of the mechanism. Fig. 3 is a rear end view in elevation of the mechanism, partly in section. Fig. 4 is a detail view of the actuating-lever and a portion of the draw-bar. Figs. 5 and 6 are diagrammatic views illustrating the throw of the actuating-lever. Fig. 7 is a plan view showing the drive mechanism connected to an ore-concentrator. l Y

While I have shown in Fig. 7 a concentrating-table, the same forms no part of the present invention, which is equally applicable to various forms of reciprocating concentratingtables, and it is not believed to be necessary to describe the same in this specification.

In the drawings the letter A is used to indicate the base of the drive mechanism, and B B standards attached to and upwardly extending from the base A. Each standard at its upper end carries a bearing C, within which works the crank-shaft D. Between the standards B works the forked lever E, which lever is fulcrumed to and between the lugs F, secured to the base A by means of the fulcrum-pin G. Each prong or arm of the forked lever E is provided at its upper end with a journal-bearing H, within which bearings is journaled a cross piece or yoke I. Through this yoke is screwed one end of a connectinglink J, being made fast thereto by a jam-nut K. The opposite end of said connecting-link is provided with a bearing L, which bearing end of the connecting-link is connected to the crank portion orarms of shaft D by means of the crank-pin M. The connecting-link J and yoke I, when fast together and concected to the crank-shaft, form a short adjustable connecting-rod between the forked lever E and crank-shaft D, the length of which connecting-rod may be varied from one and onequarter to two and one-half times the length of the crank. The object of such adjustment will be hereinafter explained.

The forked lever E at its lower end is provided with parallel guides N, upon which guides works an actuating-block O, said block having projections P, iitted to slide between the said guides N. Through the sides of the slide-block O work the set-screws Q, by means of which the f slide-block is made fast at any adjusted height upon the guides N.

The draw-rod R for actuating the concentrating-table works through and is supported by bearing-boxes S and T, secured on the frame A, and said rod passes between the arms of lever E, and at its forward end portion carries a disk U. This disk U rests against the projections P P of the adjustable actuating-block O. The draw-rod is kept at the required tension backward by means of the spiral spring V, which spring surrounds the rear end portion of the rod and bears against the face of bearing T and collar secured upon the end of said rod. To the forward end of the draw-rod is attached the collar Y, by means of which the said rod is connected to the concentrator-table.

The crank-shaft C carries at one end the tight and loose pulleys W and at the other end fly-wheel X.

By lengthening or shortening the connecting rod or link J the velocity of the lever E is decreased or increased, so as to impart a quick or slow start to the movement of the table driven by the draw-rod R, while by raising or lowering the adjusting-block O the forward feed of the material fed upon the table,

is regulated. Thus by the described mechanism the starting implulse of the table is regulated, while the forward feed or travel of material placed thereon is also controlled. A quick.or slow start of the table may thus be obtained, as desired, irrespective of the forward feed of the material fed thereon.

To increase or decrease the length of the connecting link, it is only necessary to disconnect the same from the crank-shaft and screw the link out of or in the yoke I, so as to regulate the distance of the forked lever E at its upper end from the crank-shaft.

The described movement of the lever E will be better understood by reference to Figs. 5 and 6. In Fig. 5 the movement of the lever is illustrated when the connecting-link is leugthened, while the movement of the lever illustrated by Fig. 6 is that which takes place when the connecting-link is shortened. Referring to Figs. 5 and 6, when the crank is at m, the dead-center, the lever E will be atv e. As the crank advances forward the velocity of the motion 0f the lever is gradually increased till the crank reaches the position m and the lever the position e, when the crank is at right angles to the connecting-rod and the velocity of the motion of lever E will be at its maximum. From there on the velocity of said lever will be diminished till the crank reaches the other dead-center at m2, when the lever E will be at the extreme end of the forward stroke at e2. On the backward stroke the velocity of the lever E is graduallyincreased till the crank reaches position mand the lever e', when the velocity will be at its maximum and will decrease to a standstill when the crank reaches the dead-center at mand the lever-stand at e. As seen from Figs. 5 and 6, the lever E is brought from its maximum forward velocity to a standstill and then to its maximuln velocity backward in the time that it takes the crank to travel from m to m3, while the reversing of the lever from a maximum velocity backward to the maximum velocity forward will be done in the time that it takes for the crank to travel from m3 to m', a distance far in excess of the other distance from r11/toma. Hence the reversing from backward motion to a forward motion is done slower than from the forward motion to the backward, and the effect of it will be that as the crank moves from m to m the draw-rod actuated thereby through the medium of the fulcrumed lever will be forced outward at a gradually-increased speed and its outward movement brought to a sudden stop as the crank is moved from m to m2. The return stroke of the drawrod will be a sudden or quick start during the travel of the crank from m2 to m3 and a gradual decrease in its movement while the crank is carried from m3 to m. As the concentrating-table (not shown) is connected to the forward end of the drawrod, it is obvious that the starting impulse 0f its forward stroke will be a gradual one and the termination of such stroke a sudden one, while the starting of its return stroke will be a sudden one, which gradually decreases in its movement to the end of its return stroke. 'lhe consequence of such variable motion imparted to a concentrating-table is that there will be more shifting of the material on the concentrator-table at the forward end of its motion, while going either way, than at its back end. Considering that at the forward end of the stroke the motion of the table is slowed down, the material on it will have a tendency to advance forward on its surface, while at the start of the reverse motion the material will be left forward, the table being withdrawn from beneath it.

By comparing Figs. 5 and 6 it will be seen that when the connecting-rod is shortened, as in Fig. 6, this angle from mto m3 is less and the reversing from a forward to a backward motion will be more sudden, and naturally the material on the surface of the table will shift farther and with more force at each stroke of the table. At the back end of the stroke, where the motion is slow, there will be no shifting of material at all, and at this setting of the length of connecting-rod the material will move forward on the table-surface without agitation, While the amount of feed forward can be regulated by enlarging or diminishing the stroke, which is done by raising or lowering the actuating-block O. In the case shown in Fig. 5, where the connecting-rod is two and one-half times the length of the crank, the back end is not as slow as in the case of Fig. 6. Therefore there will be some shifting of the material in the opposite direction, but far less than forward, and the material will still advance forward, but with a considerable agitation. The amount of forward feed is again adjusted by raising or lowering the actuating-block O. In this case there will be required a greater stroke to obtain the saine rate of feed forward than is the case with a shorter connecting-rod. The stroke is adjusted by raising the actuatingblock 0 when the projections P will be farther from the fulcrum G and will have more travel than when lowered toward the fulcrum.

It will thus be observed that the uniform motion of the crank-shaft is transformed so IIO 'as to impart a variable throw to the drawbar for imparting motion to the table connected thereto.

Having thus described my invention, what I claim as new, and desire to secure protection in by Letters Patent, is-

1. In a drive mechanism of the character described, the combination of a crank-shaft, a connecting-rod of a length ranging from about two and one-half times down to one and one quarter times the length of said crank, a lever driven by said connecting-rod, an adjusting-block carried by said lever and adapted to be set nearer or closer to the fulcrum of said lever, and means acted upon by said adjusting-block to transmit the motion of the lever to the mechanism to be operated.

2. In an ore-concentrator drive mechanism, the combination of a crank-shaft, an oscillating lever, a connecting-rod adapted to be lengthened or shortened so as to transform the uniform rotary motion oi' said crank into an oscillating motion of more or less variation of said lever, a draw-rod operated by said lever and connecting with the concentrator-table, and an adjusting-block carried by said lever and adapted to change the stroke of said rod.

3. In'a drive mechanism of the character described, the combination of a crank-shaft, a lever, a connecting-rod between said lever and crank-shaft, means for varying the length of the connecting-rod from about one and one-quarter to about two and one-half times the length of said crank, an adjusting-block carried by the lever and adapted to be adj usted toward or from the fulcrum of the lever, and means acted upon by said adjustingblock to transmit the motion of said lever to the mechanism to be operated, substantially as described.

4. In a drive mechanism of the character described, the combination of a part to be operated, a lever for operating the same, a

crank, a connection between said crank and said lever, means for varying the relative length of said connection, and means for adjusting the connection between said lever and said part relatively to the fulcrum of the lever, substantially as described.

5. In a drive mechanism of the character described, the combination of a part to be operated, a lever for operating the same, a crank, a connection between said crank and said lever, means for varying the length of said connection, and means for changing the connection between said lever and said part whereby the latter is caused to move a greater or less distance, substantially as described.

6. In a drive mechanism for ore-concentrar tors, the combination of a stationary frame, a crank-shaft journaled on said frame, a lever fulcrumed to said frame, a connectingrod joining the crank of said crank-shaft and said lever, means for varying the length of said connection, a draw-rod supported by said frame and adapted to be drawn in one direction by said lever, means for adjusting the connection between said rod and said lever, and means for moving said rod in the opposite direction, substantially as described.

7. In a drive mechanism of the character described, the combination of-a crank-shaft, an oscillating lever having a bifurcated part, a connecting rod between said lever and crank, a cross-piece bridging said bifurcated part through which said connecting rod passes, and means such as a jam-nut for adjusting the length of said connection between the crank and lever, substantially as described.

In Witness whereof I havehereunto set my hand.

MARcUs s'. LEv. 

